toFontRune.go

func toFontRune(fs embed.FS, fontName string, name string) (FontRune, error) {
	txt, err := fs.ReadFile(fontName + "/" + name)
	if err != nil {
		return nil, err
	}
	lines := strings.Split(string(txt), "\n")
	var fr [][]bool
	for _, line := range lines {
		if len(line) < 3 {
			continue
		}
		var l []bool
		for _, c := range line {
			l = append(l, c == blackPixel)
		}
		fr = append(fr, l)
	}
	return fr, nil
}